Pawl-press.



No. 852,528. PATENTED MAY 7, 1907.

G. SGHERF.

' I PAWL PRESS.

APiLIOATION FILED JAN. 6.190!- fiifm ass as QjWL we 407 0 1:

1H: NORRIS PETERS cm, WAsHlNuTqN, n. c.

CARL SOHERF, OF SAARBURG, GERMANY.

' PAWL-PRESS.

Specification of Letters Patent.

Patented May '7', 1907.

Application filed January 5, 1907. Serial No- 350,915.

1'0 a/ZZ whom, it may concern.-

Be it known that I, CARL Sonnnr, electrician, a subject of the King ofSaxony, residing. at Saarburg, District Trier, in the Kingdom of Prussiaand German Empire, have invented new and useful lmprovements inPawl-Presses, of which the following is a specification.

g .The subject of my invention is a pawl press having two screw spindleswith respectively rightand lefthand threads, the nuts of which, operatedby a system of levers, act upon a cross head or bridge carrying the follower.

The essential feature of the new press is that the nuts are turnedalternately instead of simultaneously, so that the cross head andfollower act as a single armed lever. In this manner, for each turn ofthe lever-system only half as much power is necessary as with priorapparatus, in which the nuts are turned simultaneously.

One form of construction of the new press is illustrated in theaccompanying drawing, in which Figure 1 is a side elevation, and Fig. 2a plan.

I On the screw spindles a, one of which has a right and the otherleft-hand thread, nuts I) are provided, which are actuated in the usualmanner each by a feed lever c 0 respectively, with drop-pawls Z. In themiddle, between the spindles a, is mounted a double-armed lever e,turning on a pin f. This lever e is provided with sockets 9 into whichlevers h are inserted to enable actuation of the lever e. The latter isconnected with the feed levers c c by pins i. These pins are furnishedwith rollers i at the top, engaging in slots 7c in the feed levers. Thetail of each of the bolts 11, can be inserted into one of the holes 1.Depending upon whether the pins 6 are inserted into the holes 1" towardthe ends, or nearer the middle, of the arms of the lever e, the powernecessary to feed forward the nuts will be less or more, respectively.The connection between the nuts I) and feed levers c c is effected bythe pawls Z, which slide vertically in the feed levers and engage incorresponding tooth-shaped recesses m in the nuts I). At their bottomends the pawls Z are chamfered. On rotation of the levers c c in onedirection the nuts I) are turned round; on rotation of these levers c cin the opposite direction, on the other hand, the pawls rise, owing totheir lower end being chamfered, and Without turning the nuts I) leaveone recess m and drop into the next.

The chamfered pawls Z are so disposed that when the lever-system is setin operation for the purpose of pressing, the nuts 0 are turnedalternately, the one being actuated while the other is left unoperatedby the corresponding pawl Z. The nuts I) thus act in turns upon thecross-head 0, which consists of girders, and which again transmits thepower to the follower p, located at the center Owing to the alternatefeed of the nuts I), which amount to at most 1-2 mms., the head 0 actsas a single armed lever. The force which has to be exerted on the leverh is, therefore, only half of that which would be requisite were nutsboth turned simultaneously.

The rotation of the various parts, necessary owing to the one sldedmotion of the cross-head andfollower, is enabled by the provision ofrounded pressing-surfaces.

Instead of the nuts I) being turned by pinpawls, the rotation may beeffected by ordinary ratchet pawls engagingsuitable teeth provided onthe top of the nut.

What I do claim as my invention and desire to secure by Letters Patent,is z A pawl press comprising two screw spindles, having respectivelyright and left hand threads, a nut on each spindle, a cross head guidedby the said spindles, a follower on said cross head, a double-armedlever pivoted'at the center of said cross-head, a lever jointed to eacharm of said double-armed lever, and pawls at the free ends of saidlevers adapted to engage the nuts on the screw spindles so as toalternately screw said nuts down.

In testimony whereof I have signed my name'to this specification in thepresence of two subscribing witnesses.

CARL SOHERF.

Witnesses:

ALBERT FISCHER, ADoLF CHEVALIER.

